Bohemia Interactive is celebrating its 15 year anniversary with a Steam sale including a free game.

From now until Monday, 10 am PT, Steam members can claim a free copy of ARMA: Cold War Assault. All users have to do is initiate a download and it'll be added to the account permanently. Just click here to get your free copy.

If you want to try something more recent, ARMA III is now free for the weekend. To be clear, it's only playable for free for the next two days, but if you find that it's your type of game, you can purchase it at a 40 percent discount ($35.99).

The rest of Bohemia's catalog are also on sale for up to 80 percent discount. DayZ, its popular zombie survival game, is on sale for 15 percent off ($25.49). Remember though, the game is in Steam Early Access.